linux-kernel - Re: [ckrm-tech] [PATCH 7/7] containers (V7): Container interface to nsproxy subsystem

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Message-ID: <20070402140938.GF17710@sergelap.austin.ibm.com>
Date:	Mon, 2 Apr 2007 09:09:39 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Srivatsa Vaddagiri <vatsa@...ibm.com>
Cc:	menage@...gle.com, akpm@...l.org, pj@....com, sekharan@...ibm.com,
	dev@...ru, xemul@...ru, serue@...ibm.com, ebiederm@...ssion.com,
	ckrm-tech@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	containers@...ts.osdl.org, mbligh@...gle.com, winget@...gle.com,
	rohitseth@...gle.com, devel@...nvz.org
Subject: Re: [ckrm-tech] [PATCH 7/7] containers (V7): Container interface to nsproxy subsystem

Quoting Srivatsa Vaddagiri (vatsa@...ibm.com):
> On Mon, Feb 12, 2007 at 12:15:28AM -0800, menage@...gle.com wrote:
> > +int ns_container_clone(struct task_struct *tsk)
> > +{
> > +	return container_clone(tsk, &ns_subsys);
> > +}
> 
> This function is a no-op if ns hierarchy is not mounted at this point.
> This would mean that we will miss out on some directories in ns
> hierarchy if it happened to be mounted later. It would be nice to
> recreate such missing directories upon mount. However I suspect it would
> not be easy ..Maybe we need to scan the task list and (re-)invoke
> ns_container_clone() for every new tsk->nsproxy we find in the list.
> Alternately perhaps we could auto mount (kern_mount) ns hierarchy very early at
> bootup? On the flip side that would require remount support so that additional
> controllers (like cpuset, mem) can be bound to (non-empty) ns hierarchy after
> bootup.

Losing the directory isn't a big deal though.  And both unsharing a
namespace (which causes a ns_container_clone) and mounting the hierarchy
are done by userspace, so if for some installation it is a big deal,
the init scripts on initrd can mount the hierarchy before doing any
unsharing.

Can you think of a reason why losing a few directories matters?

-serge
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